Hi all,
is there a feature or pattern for adding a listener that is to be executed
(at most) once? For example, say you want to send an email when user is
created and the session is committed. If event.listen() supported a "once"
boolean parameter, this could be expressed as:
def email_user(email_address, message):
...
...
if valid_data:
new_user = User(**valid_data)
db.session.add(new_user)
# send an email to new_user after committing
event.listen(db.session, "after_commit",
once=True, # hypothetical parameter
lambda session: email_user(new_user.email, "welcome
{}!".format(new_user.name))
Thanks,
George
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